I wouldn't let that get you down too much. Stalls in the CRJ are nasty, at best.

At my airline, you don't get immediately washed out and terminated. They will tell you that the end is very near, giving you the opportunity to resign and keep your dignity.
But like said before, don't try to cover up for it. If asked, say exactly what you just said. You didn't feel comfortable with continuing on at the pace they requested. But if given another opportunity, you could take what you've already learned and apply it more.......